#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <vector>
using namespace std;
int main() {
	vector<int> a,b;
	a.push_back(1); a.push_back(2); a.push_back(3);
	b=a;
	a[0]=100;
	cout<<b[0]<<endl;
	return 0;
}
